Two Fifty Four are London newcomers and sisters Hannah and Colette Thurlow. They are currently unsigned, but judging from this single, the first from their upcoming EP, I hope that changes soon.
Here is their MySpace page, check it out and give 'em some support -
http://www.myspace.com/thetwofiftyfour
How great is it that MySpace is still going strong as a place for musicians. Too cool